Also look at clientexec(http://www.clientexec.com). It is a pretty good package and the support staff is one of the best I have worked with.
As for phpManager, you may want to go over the WHT and search there for reviews. I have a license and have had problems off and on. With the new ownership things seems to be getting worse. We will have to see how version 2 is and how the new owner provides support. He recently went on vacation for about three weeks when he was the only one who could validate or transfer a license or give a user access to the helpdesk.